State functions like pressure, volume, and temperature are often normalized to a "reduced" form based
 on their values at this point, which can calculated using the Joback and Lydersen methods. Below this
 point, the Van der 
State functions like pressure, volume, and temperature are often normalized to a "reduced" form based
 on their values at this point, which can calculated using the Joback and Lydersen methods. Below this
 point, the Van der Waals equation gives a region where pressure increases as volume increases; that
 problem is fixed with the Maxwell isotherm. According to the Guldberg rule, a liquid's boiling point is
 about two thirds its temperature at this point. Above this point, carbon dioxide is often used as a green
 alternative method to remove caffeine from coffee. This point is also characterized by a nearly vertical line
 on a phase diagram. For 10 points, name this point seen on a phase diagram at which a liquid and gas cease
 to be separate phases.
State functions like pressure, volume, and temperature are often normalized to a "reduced" form based
 on their values at this point, which can calculated using the Joback and Lydersen methods.
{critical} point [or {critical} temperature]